public class ExchangeRate {

    public static void main(String[] args) {
        ExchangeRate rate = new ExchangeRate();
        double[] arr = new double[] {1, 10, 100};
        rate.change(arr);
        for (double a : arr){
            System.out.println(a);
        }

    }

    public void change(double[] arr){
        for (int i=0; i<arr.length; i++){
            arr[i] = arr[i] * 6.903;
        }
    }
}
